posted
I just got some DD 9012 2/2 are these actually 2ohm coils or what? I hooked them up as a 4 ohm load to break them in for a few days of box/port testing and everything was fine! And I was looking forward to dropping them to a 1 ohm load so they would see the full 1,000 watts from my amps instead of the 250 I wanted to test/break them in with. But my amps will not play a note when I try it! any idea why? I'm using (well trying) an Xtant 1001dx on each. I've ran both these amps at 1ohm (or slightly below) before without any problems at all! And even now no protection lights or anything come on,just no sound! I hooked the amps to a pair of 2/2 kickers without any problems today even though! this sucks!
posted
Make sure the voice coils are wired in phase, + to + and - to -. Also, check to see if any of the terminals on the DD are touching anywhere. Try hooking other subs up to the amp to make sure it still works. If all those fail, check the resistance of the voice coils with a DMM to make sure they aren't wrecked.
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posted
I think he is talking about what the amp sees
When you "bridge" an amp by inverting the left channel in theory the amp sees 1/2 the load across both channels <---(K.I.S.S. theory) so if you have a 4 ohm load to the amp and you bridge it the amp sees a 2 ohm load.
2ohm + 2 ohm = 4 ohms series-- end of story. what the amp "sees" might differ due to how the wiring is done.
2ohm + 2 ohm =1 ohm paralleled-- end of story. what the amp "sees" might differ due to how the wiring is done.
use an ohm meter if you want the true DCR of the coils
quote:Originally posted by Iboomalot: I think he is talking about what the amp sees
Hmm ok that makes sense ,for a bridged amp I guess, but I'm using a one channel mono amp so shouldn't the amp see 2+2 = 1 ohm and not 1/2ohm?
After debating this with a few other people and trying a few different hook-ups out I think I have either bad wiring somewhere else? or not enough power to my amps? Either sub will play alone hooked up @what I think is 1ohm on either amp now but they will NOT both play at once @ 1ohm,both amps stay on but not a note comes out!But both will play together fine at 4ohms!
Back to the drawing board I go I guess,this is getting really nerve racking! 100% new system and I have yet to hear it at least hear it all at once.
posted
It looks like the confusion lies in the fact that he has TWO amplifiers. If you wire one sub to each amplifier, then yes, you could either get 1 ohm (parallel) or 4 ohms (series) PER AMP. However, if you wire both subs up to only one amp, you will have either 0.5 ohm (all parallel), 2 ohms (series/parallel), or 8 ohms (all series).
As far as why your system doesn't play with both amps in use, I'm not sure. If both amps work individually but not simultaneously, then it would seem that this would eliminate a possible wiring problem, because the amps do work. As long as each sub is wired to its own amp in parallel to get the 1 ohm load per amp, it should work fine. The only thing I can recommend is to double checking your connections, especially your input signal.
the Xtant1001 is only 2ohm stable, 1000@2ohm. Maybe it doesn't like the 1ohm your giving it.
the best u can do is run the subs at 4ohm, 500krm. You have two sets of Terminals, T1 and T2
T1+ goes to T2- then run T1- and T2+ to the amp.
what you should have done it brought dual 1ohm subwoofers. Then you could run them at 2ohm and later on slap some class d DEI1000D to each coil.
Or if you can I'd adive you to sell the amps. And purchase two Class D monoblocks that do around 1000+@1ohm.
jaggy
SAY WHAT?????????????????? the box, the book everything says specs = 250watts at 4ohms 500watts at 2ohms and 1,000watts at 1ohm ! 1ohm stable and they've ran at 1ohm before with no problems at all! even the newer X series are 1ohm stable.ALL class a xtants will run 2ohm stable sure thats not what you mean?
the Xtant1001 is only 2ohm stable, 1000@2ohm. Maybe it doesn't like the 1ohm your giving it.
the best u can do is run the subs at 4ohm, 500krm. You have two sets of Terminals, T1 and T2
T1+ goes to T2- then run T1- and T2+ to the amp.
what you should have done it brought dual 1ohm subwoofers. Then you could run them at 2ohm and later on slap some class d DEI1000D to each coil.
Or if you can I'd adive you to sell the amps. And purchase two Class D monoblocks that do around 1000+@1ohm.
jaggy
WRONG!!!! I know for a FACT that they do run at 1 ohm because i had it running my dual 4 ohm subs and im the one who sold him one of his amps(btw, let me know if you need that other xtant). Shoot, i even had the sub channel of a 603x running at 1 ohm mono and they said that couldnt be done .
The xtant will do 1 ohm all day running off a stock charging system like i had in my car unlke most amps out there that cant.
Thanks for the xtant support good4me but I'm not trying to start a which amp is better post ,we know just kidding
But I did double check my facts to make sure and my manuals,the online manuals,the boxes and the techs at xtant all told me the 1001dx's and 1001d's put out:
250watts X 1 @ 4 ohms
500watts X 1 @ 2 ohms
1000watts X 1 @ 1ohm (the techs actually said about 1,200
I know they will do 1ohm though anyways because like I said before I tested them with 2/2 L7's the same day I couldn't make both DD 2/2's play!
BUT here a new one to me The xtant techs say the DD's might have true(er) V/C loads or present different loads playing in the different boxes and make the amps push more power then the L7's . said 1/2ohm per amp would change the current draw (hopefully I explained that right?). And that my electical system isn't enough to power TWO 1001's at 1ohm. Could this be the problem? Is this true? If so guess It's off to buy another yellow top and make a pit stop at the battery forum.
Man you guys really had me hoping I was wrong if the 1001's would give 1,000 watts@2ohms I could of run one per coil!
Anyways I gotta figure this out soon one DD is unbelievably loud I'm going nutts waiting to hear two together! And really wanting to order another pair!
p.s. good4me get ahold of me! 3 1001's won't look right we'll have to talk about that other one so I can either get another pair of DD's or bridge pairs of 1001's ?
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